Izinto ezibalulekile zeumshini wokuthola izithombeukuhlolwa
Isikhathi sobubanzi kanye nesikhathi sokukhuphuka (esaziwa nangokuthi isikhathi sokuphendula) sama-photodetector, njengezinto ezibalulekile ekuhlolweni kwama-detector, okwamanje sidonsele ukunaka kwabacwaningi abaningi be-optoelectronic. Kodwa-ke, umbhali uthole ukuthi abantu abaningi abanalo nhlobo ulwazi lwalezi zinhlaka ezimbili. Namuhla, i-JIMu Optoresearch izokwethula ngqo i-bandwidth kanye nesikhathi sokukhuphuka kwama-photodetector kuwo wonke umuntu.
Esihlokweni esandulele mayelana nokukhethwa kwamapharamitha ayinhlokoama-photodiode, sethule ukuthi kokubili isikhathi sokukhuphuka (τr) kanye nesikhathi sokuwa (τf) kuyizinkomba ezibalulekile zokulinganisa isivinini sokuphendula sama-photodetector. I-bandwidth ye-3dB, njengenkomba kusizinda semvamisa, ihlobene eduze nesikhathi sokukhuphuka ngokwejubane lokuphendula. Ubudlelwano phakathi kwe-bandwidth BW ye-photodetector kanye nesikhathi sayo sokuphendula i-Tr bungaguqulwa cishe ngale ndlela elandelayo: Tr=0.35/BW.
Isikhathi sokukhuphuka yigama kubuchwepheshe be-pulse, elichaza futhi lisho ukuthi isignali ikhuphuka isuka endaweni eyodwa (ngokuvamile: Vout*10%) iye kwenye indawo (ngokuvamile: Vout*90%). Ubukhulu bomphetho okhuphukayo wesignali ye-Rise Time ngokuvamile bubhekisela esikhathini esithathwayo ukukhuphuka isuka ku-10% iye ku-90%. Isimiso sokuhlola: Isignali idluliselwa endleleni ethile, bese kusetshenziswa enye ikhanda lesampula ukuthola nokukala inani le-voltage pulse ekugcineni okude.
Isikhathi sokukhuphuka kwesignali sibalulekile ekuqondeni izinkinga zobuqotho besignali. Iningi lezinkinga ezihlobene nokusebenza kokusetshenziswa komkhiqizo ekwakhiweni kwei-photodetector yesivinini esikhuluzihlotshaniswa nayo. Uma ukhetha i-photodetector, kufanele uyinake ngokwanele. Kubalulekile ukuthi sisungule umqondo wokuthi isikhathi sokukhuphuka sinomthelela omkhulu ekusebenzeni kwesekethe. Uma nje singaphakathi kwebanga elithile, kumele sithathwe ngokungathi sína, noma ngabe singububanzi obungacacile. Asikho isidingo sokuchaza ngokunembile leli zinga lebanga, futhi alibalulekile. Khumbula nje ukuthi ubuchwepheshe bamanje bokucubungula ama-chip benze lesi sikhathi sibe sifushane kakhulu, safinyelela ezingeni le-ps. Sekuyisikhathi sokuba unake umthelela waso.
Njengoba isikhathi sokukhuphuka kwesignali sincipha, izinkinga ezifana nokuzindla, ukukhuluma nge-crosstalk, ukuwa kwe-orbit, imisebe kagesi, kanye nokugxuma komhlaba okubangelwa isignali yangaphakathi noma isignali yokuphuma kwe-photodetector kuba nzima kakhulu, futhi inkinga yomsindo iba nzima ukuyixazulula. Ngokombono wokuhlaziywa kwe-spectral, ukunciphisa isikhathi sokukhuphuka kwesignali kufana nokwanda komkhawulokudonsa wesignali, okungukuthi, kunezingxenye eziningi zemvamisa ephezulu esignalini. Yilezi zingxenye zemvamisa ephezulu ezenza umklamo ube nzima. Imigqa yokuxhumana kumele iphathwe njengemigqa yokudlulisela, okuholele ezinkingeni eziningi ezazingekho ngaphambili.
Ngakho-ke, enkambisweni yokufaka ama-photodetector, kumele ube nomqondo onjalo: lapho isignali yokukhipha ye-photodetector inomphetho okhuphukayo noma ngisho nokudubula okukhulu, futhi isignali ingazinzile, kungenzeka kakhulu ukuthi i-photodetector oyithengile ayihlangabezani nezidingo zomklamo ezifanele zobuqotho besignali futhi ayikwazi ukuhlangabezana nezidingo zakho zangempela zohlelo lokusebenza ngokwemigomo ye-bandwidth kanye nemingcele yesikhathi sokukhuphuka. Imikhiqizo ye-photoelectric detector ye-JIMU Guangyan yonke isampula ama-photoelectric chips akamuva athuthukisiwe, ama-high-speed operating amplifier chips, kanye nama-filter circuits aqondile. Ngokwezimpawu zangempela zesignali yesicelo samakhasimende, zihambisana ne-bandwidth kanye nesikhathi sokukhuphuka. Isinyathelo ngasinye sicabangela ubuqotho besignali. Gwema izinkinga ezivamile ezifana nomsindo wesignali ophezulu kanye nokuzinza okubi okubangelwa ukungalingani phakathi kwe-bandwidth kanye nesikhathi sokukhuphuka ekusetshenzisweni kwama-photodetector kubasebenzisi.
Isikhathi sokuthunyelwe: Septhemba 15-2025